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                    结构体
            
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                    JSON
            
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                    文本和HTML模板
            
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                    函数
            
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                    函数声明
            
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                    函数值
            
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                    可变参数
            
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                    Deferred函数
            
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                    Panic异常
            
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                    Recover捕获异常
            
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                    方法
            
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                    方法声明
            
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                    基于指针对象的方法
            
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                    通过嵌入结构体来扩展类型
            
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                    方法值和方法表达式
            
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                    示例: Bit数组
            
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                    封装
            
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                    接口
            
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                    接口是合约
            
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                    接口类型
            
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                    实现接口的条件
            
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                    flag.Value接口
            
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                    接口值
            
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                    sort.Interface接口
            
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                    http.Handler接口
            
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                    error接口
            
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                    示例: 表达式求值
            
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                    类型断言
            
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                    基于类型断言识别错误类型
            
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                    通过类型断言查询接口
            
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                    类型分支
            
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                    示例: 基于标记的XML解码
            
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                    补充几点
            
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                    Goroutines和Channels
            
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                    Goroutines
            
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                    示例: 并发的Clock服务
            
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        <li class="chapter " data-level="1.9.3" data-path="../ch8/ch8-03.html">
            
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                    示例: 并发的Echo服务
            
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                    Channels
            
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                    并发的循环
            
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        <li class="chapter " data-level="1.9.6" data-path="../ch8/ch8-06.html">
            
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                    示例: 并发的Web爬虫
            
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                    基于select的多路复用
            
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                    示例: 并发的目录遍历
            
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        <li class="chapter " data-level="1.9.9" data-path="../ch8/ch8-09.html">
            
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                    并发的退出
            
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                    示例: 聊天服务
            
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        <li class="chapter " data-level="1.10" data-path="../ch9/ch9.html">
            
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                    基于共享变量的并发
            
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                    竞争条件
            
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        <li class="chapter " data-level="1.10.2" data-path="../ch9/ch9-02.html">
            
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                    sync.Mutex互斥锁
            
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        <li class="chapter " data-level="1.10.3" data-path="../ch9/ch9-03.html">
            
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                    sync.RWMutex读写锁
            
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                    内存同步
            
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                    sync.Once惰性初始化
            
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        <li class="chapter " data-level="1.10.6" data-path="../ch9/ch9-06.html">
            
                <a href="../ch9/ch9-06.html">
            
                    
                    竞争条件检测
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.10.7" data-path="../ch9/ch9-07.html">
            
                <a href="../ch9/ch9-07.html">
            
                    
                    示例: 并发的非阻塞缓存
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.10.8" data-path="../ch9/ch9-08.html">
            
                <a href="../ch9/ch9-08.html">
            
                    
                    Goroutines和线程
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="1.11" data-path="../ch10/ch10.html">
            
                <a href="../ch10/ch10.html">
            
                    
                    包和工具
            
                </a>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="1.11.1" data-path="../ch10/ch10-01.html">
            
                <a href="../ch10/ch10-01.html">
            
                    
                    包简介
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.11.2" data-path="../ch10/ch10-02.html">
            
                <a href="../ch10/ch10-02.html">
            
                    
                    导入路径
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.11.3" data-path="../ch10/ch10-03.html">
            
                <a href="../ch10/ch10-03.html">
            
                    
                    包声明
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.11.4" data-path="../ch10/ch10-04.html">
            
                <a href="../ch10/ch10-04.html">
            
                    
                    导入声明
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.11.5" data-path="../ch10/ch10-05.html">
            
                <a href="../ch10/ch10-05.html">
            
                    
                    包的匿名导入
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.11.6" data-path="../ch10/ch10-06.html">
            
                <a href="../ch10/ch10-06.html">
            
                    
                    包和命名
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.11.7" data-path="../ch10/ch10-07.html">
            
                <a href="../ch10/ch10-07.html">
            
                    
                    工具
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="1.12" data-path="../ch11/ch11.html">
            
                <a href="../ch11/ch11.html">
            
                    
                    测试
            
                </a>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="1.12.1" data-path="../ch11/ch11-01.html">
            
                <a href="../ch11/ch11-01.html">
            
                    
                    go test
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.12.2" data-path="../ch11/ch11-02.html">
            
                <a href="../ch11/ch11-02.html">
            
                    
                    测试函数
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.12.3" data-path="../ch11/ch11-03.html">
            
                <a href="../ch11/ch11-03.html">
            
                    
                    测试覆盖率
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.12.4" data-path="../ch11/ch11-04.html">
            
                <a href="../ch11/ch11-04.html">
            
                    
                    基准测试
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.12.5" data-path="../ch11/ch11-05.html">
            
                <a href="../ch11/ch11-05.html">
            
                    
                    剖析
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.12.6" data-path="../ch11/ch11-06.html">
            
                <a href="../ch11/ch11-06.html">
            
                    
                    示例函数
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="1.13" data-path="../ch12/ch12.html">
            
                <a href="../ch12/ch12.html">
            
                    
                    反射
            
                </a>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="1.13.1" data-path="../ch12/ch12-01.html">
            
                <a href="../ch12/ch12-01.html">
            
                    
                    为何需要反射?
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.13.2" data-path="../ch12/ch12-02.html">
            
                <a href="../ch12/ch12-02.html">
            
                    
                    reflect.Type和reflect.Value
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.13.3" data-path="../ch12/ch12-03.html">
            
                <a href="../ch12/ch12-03.html">
            
                    
                    Display递归打印
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.13.4" data-path="../ch12/ch12-04.html">
            
                <a href="../ch12/ch12-04.html">
            
                    
                    示例: 编码S表达式
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.13.5" data-path="../ch12/ch12-05.html">
            
                <a href="../ch12/ch12-05.html">
            
                    
                    通过reflect.Value修改值
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.13.6" data-path="../ch12/ch12-06.html">
            
                <a href="../ch12/ch12-06.html">
            
                    
                    示例: 解码S表达式
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.13.7" data-path="../ch12/ch12-07.html">
            
                <a href="../ch12/ch12-07.html">
            
                    
                    获取结构体字段标签
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.13.8" data-path="../ch12/ch12-08.html">
            
                <a href="../ch12/ch12-08.html">
            
                    
                    显示一个类型的方法集
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.13.9" data-path="../ch12/ch12-09.html">
            
                <a href="../ch12/ch12-09.html">
            
                    
                    几点忠告
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="1.14" data-path="../ch13/ch13.html">
            
                <a href="../ch13/ch13.html">
            
                    
                    底层编程
            
                </a>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="1.14.1" data-path="../ch13/ch13-01.html">
            
                <a href="../ch13/ch13-01.html">
            
                    
                    unsafe.Sizeof, Alignof 和 Offsetof
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.14.2" data-path="../ch13/ch13-02.html">
            
                <a href="../ch13/ch13-02.html">
            
                    
                    unsafe.Pointer
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.14.3" data-path="../ch13/ch13-03.html">
            
                <a href="../ch13/ch13-03.html">
            
                    
                    示例: 深度相等判断
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.14.4" data-path="../ch13/ch13-04.html">
            
                <a href="../ch13/ch13-04.html">
            
                    
                    通过cgo调用C代码
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.14.5" data-path="../ch13/ch13-05.html">
            
                <a href="../ch13/ch13-05.html">
            
                    
                    几点忠告
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="1.15" data-path="../appendix/appendix.html">
            
                <a href="../appendix/appendix.html">
            
                    
                    附录
            
                </a>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="1.15.1" data-path="../appendix/appendix-a-errata.html">
            
                <a href="../appendix/appendix-a-errata.html">
            
                    
                    附录A：原文勘误
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.15.2" data-path="../appendix/appendix-b-author.html">
            
                <a href="../appendix/appendix-b-author.html">
            
                    
                    附录B：作者译者
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.15.3" data-path="../appendix/appendix-c-cpoyright.html">
            
                <a href="../appendix/appendix-c-cpoyright.html">
            
                    
                    附录C：译文授权
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.15.4" data-path="../appendix/appendix-d-translations.html">
            
                <a href="../appendix/appendix-d-translations.html">
            
                    
                    附录D：其它语言
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    

    

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                                <h2 id="46-&#x6587;&#x672C;&#x548C;html&#x6A21;&#x677F;">4.6. &#x6587;&#x672C;&#x548C;HTML&#x6A21;&#x677F;</h2>
<p>&#x524D;&#x9762;&#x7684;&#x4F8B;&#x5B50;&#xFF0C;&#x53EA;&#x662F;&#x6700;&#x7B80;&#x5355;&#x7684;&#x683C;&#x5F0F;&#x5316;&#xFF0C;&#x4F7F;&#x7528;Printf&#x662F;&#x5B8C;&#x5168;&#x8DB3;&#x591F;&#x7684;&#x3002;&#x4F46;&#x662F;&#x6709;&#x65F6;&#x5019;&#x4F1A;&#x9700;&#x8981;&#x590D;&#x6742;&#x7684;&#x6253;&#x5370;&#x683C;&#x5F0F;&#xFF0C;&#x8FD9;&#x65F6;&#x5019;&#x4E00;&#x822C;&#x9700;&#x8981;&#x5C06;&#x683C;&#x5F0F;&#x5316;&#x4EE3;&#x7801;&#x5206;&#x79BB;&#x51FA;&#x6765;&#x4EE5;&#x4FBF;&#x66F4;&#x5B89;&#x5168;&#x5730;&#x4FEE;&#x6539;&#x3002;&#x8FD9;&#x4E9B;&#x529F;&#x80FD;&#x662F;&#x7531;text/template&#x548C;html/template&#x7B49;&#x6A21;&#x677F;&#x5305;&#x63D0;&#x4F9B;&#x7684;&#xFF0C;&#x5B83;&#x4EEC;&#x63D0;&#x4F9B;&#x4E86;&#x4E00;&#x4E2A;&#x5C06;&#x53D8;&#x91CF;&#x503C;&#x586B;&#x5145;&#x5230;&#x4E00;&#x4E2A;&#x6587;&#x672C;&#x6216;HTML&#x683C;&#x5F0F;&#x7684;&#x6A21;&#x677F;&#x7684;&#x673A;&#x5236;&#x3002;</p>
<p>&#x4E00;&#x4E2A;&#x6A21;&#x677F;&#x662F;&#x4E00;&#x4E2A;&#x5B57;&#x7B26;&#x4E32;&#x6216;&#x4E00;&#x4E2A;&#x6587;&#x4EF6;&#xFF0C;&#x91CC;&#x9762;&#x5305;&#x542B;&#x4E86;&#x4E00;&#x4E2A;&#x6216;&#x591A;&#x4E2A;&#x7531;&#x53CC;&#x82B1;&#x62EC;&#x53F7;&#x5305;&#x542B;&#x7684;<code>{{action}}</code>&#x5BF9;&#x8C61;&#x3002;&#x5927;&#x90E8;&#x5206;&#x7684;&#x5B57;&#x7B26;&#x4E32;&#x53EA;&#x662F;&#x6309;&#x5B57;&#x9762;&#x503C;&#x6253;&#x5370;&#xFF0C;&#x4F46;&#x662F;&#x5BF9;&#x4E8E;actions&#x90E8;&#x5206;&#x5C06;&#x89E6;&#x53D1;&#x5176;&#x5B83;&#x7684;&#x884C;&#x4E3A;&#x3002;&#x6BCF;&#x4E2A;actions&#x90FD;&#x5305;&#x542B;&#x4E86;&#x4E00;&#x4E2A;&#x7528;&#x6A21;&#x677F;&#x8BED;&#x8A00;&#x4E66;&#x5199;&#x7684;&#x8868;&#x8FBE;&#x5F0F;&#xFF0C;&#x4E00;&#x4E2A;action&#x867D;&#x7136;&#x7B80;&#x77ED;&#x4F46;&#x662F;&#x53EF;&#x4EE5;&#x8F93;&#x51FA;&#x590D;&#x6742;&#x7684;&#x6253;&#x5370;&#x503C;&#xFF0C;&#x6A21;&#x677F;&#x8BED;&#x8A00;&#x5305;&#x542B;&#x901A;&#x8FC7;&#x9009;&#x62E9;&#x7ED3;&#x6784;&#x4F53;&#x7684;&#x6210;&#x5458;&#x3001;&#x8C03;&#x7528;&#x51FD;&#x6570;&#x6216;&#x65B9;&#x6CD5;&#x3001;&#x8868;&#x8FBE;&#x5F0F;&#x63A7;&#x5236;&#x6D41;if-else&#x8BED;&#x53E5;&#x548C;range&#x5FAA;&#x73AF;&#x8BED;&#x53E5;&#xFF0C;&#x8FD8;&#x6709;&#x5176;&#x5B83;&#x5B9E;&#x4F8B;&#x5316;&#x6A21;&#x677F;&#x7B49;&#x8BF8;&#x591A;&#x7279;&#x6027;&#x3002;&#x4E0B;&#x9762;&#x662F;&#x4E00;&#x4E2A;&#x7B80;&#x5355;&#x7684;&#x6A21;&#x677F;&#x5B57;&#x7B26;&#x4E32;&#xFF1A;</p>
<p><u><i>gopl.io/ch4/issuesreport</i></u></p>
<pre><code class="lang-Go"><span class="hljs-keyword">const</span> templ = <span class="hljs-string">`{{.TotalCount}} issues:
{{range .Items}}----------------------------------------
Number: {{.Number}}
User:   {{.User.Login}}
Title:  {{.Title | printf &quot;%.64s&quot;}}
Age:    {{.CreatedAt | daysAgo}} days
{{end}}`</span>
</code></pre>
<p>&#x8FD9;&#x4E2A;&#x6A21;&#x677F;&#x5148;&#x6253;&#x5370;&#x5339;&#x914D;&#x5230;&#x7684;issue&#x603B;&#x6570;&#xFF0C;&#x7136;&#x540E;&#x6253;&#x5370;&#x6BCF;&#x4E2A;issue&#x7684;&#x7F16;&#x53F7;&#x3001;&#x521B;&#x5EFA;&#x7528;&#x6237;&#x3001;&#x6807;&#x9898;&#x8FD8;&#x6709;&#x5B58;&#x5728;&#x7684;&#x65F6;&#x95F4;&#x3002;&#x5BF9;&#x4E8E;&#x6BCF;&#x4E00;&#x4E2A;action&#xFF0C;&#x90FD;&#x6709;&#x4E00;&#x4E2A;&#x5F53;&#x524D;&#x503C;&#x7684;&#x6982;&#x5FF5;&#xFF0C;&#x5BF9;&#x5E94;&#x70B9;&#x64CD;&#x4F5C;&#x7B26;&#xFF0C;&#x5199;&#x4F5C;&#x201C;.&#x201D;&#x3002;&#x5F53;&#x524D;&#x503C;&#x201C;.&#x201D;&#x6700;&#x521D;&#x88AB;&#x521D;&#x59CB;&#x5316;&#x4E3A;&#x8C03;&#x7528;&#x6A21;&#x677F;&#x65F6;&#x7684;&#x53C2;&#x6570;&#xFF0C;&#x5728;&#x5F53;&#x524D;&#x4F8B;&#x5B50;&#x4E2D;&#x5BF9;&#x5E94;github.IssuesSearchResult&#x7C7B;&#x578B;&#x7684;&#x53D8;&#x91CF;&#x3002;&#x6A21;&#x677F;&#x4E2D;<code>{{.TotalCount}}</code>&#x5BF9;&#x5E94;action&#x5C06;&#x5C55;&#x5F00;&#x4E3A;&#x7ED3;&#x6784;&#x4F53;&#x4E2D;TotalCount&#x6210;&#x5458;&#x4EE5;&#x9ED8;&#x8BA4;&#x7684;&#x65B9;&#x5F0F;&#x6253;&#x5370;&#x7684;&#x503C;&#x3002;&#x6A21;&#x677F;&#x4E2D;<code>{{range .Items}}</code>&#x548C;<code>{{end}}</code>&#x5BF9;&#x5E94;&#x4E00;&#x4E2A;&#x5FAA;&#x73AF;action&#xFF0C;&#x56E0;&#x6B64;&#x5B83;&#x4EEC;&#x4E4B;&#x95F4;&#x7684;&#x5185;&#x5BB9;&#x53EF;&#x80FD;&#x4F1A;&#x88AB;&#x5C55;&#x5F00;&#x591A;&#x6B21;&#xFF0C;&#x5FAA;&#x73AF;&#x6BCF;&#x6B21;&#x8FED;&#x4EE3;&#x7684;&#x5F53;&#x524D;&#x503C;&#x5BF9;&#x5E94;&#x5F53;&#x524D;&#x7684;Items&#x5143;&#x7D20;&#x7684;&#x503C;&#x3002;</p>
<p>&#x5728;&#x4E00;&#x4E2A;action&#x4E2D;&#xFF0C;<code>|</code>&#x64CD;&#x4F5C;&#x7B26;&#x8868;&#x793A;&#x5C06;&#x524D;&#x4E00;&#x4E2A;&#x8868;&#x8FBE;&#x5F0F;&#x7684;&#x7ED3;&#x679C;&#x4F5C;&#x4E3A;&#x540E;&#x4E00;&#x4E2A;&#x51FD;&#x6570;&#x7684;&#x8F93;&#x5165;&#xFF0C;&#x7C7B;&#x4F3C;&#x4E8E;UNIX&#x4E2D;&#x7BA1;&#x9053;&#x7684;&#x6982;&#x5FF5;&#x3002;&#x5728;Title&#x8FD9;&#x4E00;&#x884C;&#x7684;action&#x4E2D;&#xFF0C;&#x7B2C;&#x4E8C;&#x4E2A;&#x64CD;&#x4F5C;&#x662F;&#x4E00;&#x4E2A;printf&#x51FD;&#x6570;&#xFF0C;&#x662F;&#x4E00;&#x4E2A;&#x57FA;&#x4E8E;fmt.Sprintf&#x5B9E;&#x73B0;&#x7684;&#x5185;&#x7F6E;&#x51FD;&#x6570;&#xFF0C;&#x6240;&#x6709;&#x6A21;&#x677F;&#x90FD;&#x53EF;&#x4EE5;&#x76F4;&#x63A5;&#x4F7F;&#x7528;&#x3002;&#x5BF9;&#x4E8E;Age&#x90E8;&#x5206;&#xFF0C;&#x7B2C;&#x4E8C;&#x4E2A;&#x52A8;&#x4F5C;&#x662F;&#x4E00;&#x4E2A;&#x53EB;daysAgo&#x7684;&#x51FD;&#x6570;&#xFF0C;&#x901A;&#x8FC7;time.Since&#x51FD;&#x6570;&#x5C06;CreatedAt&#x6210;&#x5458;&#x8F6C;&#x6362;&#x4E3A;&#x8FC7;&#x53BB;&#x7684;&#x65F6;&#x95F4;&#x957F;&#x5EA6;&#xFF1A;</p>
<pre><code class="lang-Go"><span class="hljs-keyword">func</span> daysAgo(t time.Time) <span class="hljs-keyword">int</span> {
    <span class="hljs-keyword">return</span> <span class="hljs-keyword">int</span>(time.Since(t).Hours() / <span class="hljs-number">24</span>)
}
</code></pre>
<p>&#x9700;&#x8981;&#x6CE8;&#x610F;&#x7684;&#x662F;CreatedAt&#x7684;&#x53C2;&#x6570;&#x7C7B;&#x578B;&#x662F;time.Time&#xFF0C;&#x5E76;&#x4E0D;&#x662F;&#x5B57;&#x7B26;&#x4E32;&#x3002;&#x4EE5;&#x540C;&#x6837;&#x7684;&#x65B9;&#x5F0F;&#xFF0C;&#x6211;&#x4EEC;&#x53EF;&#x4EE5;&#x901A;&#x8FC7;&#x5B9A;&#x4E49;&#x4E00;&#x4E9B;&#x65B9;&#x6CD5;&#x6765;&#x63A7;&#x5236;&#x5B57;&#x7B26;&#x4E32;&#x7684;&#x683C;&#x5F0F;&#x5316;&#xFF08;&#xA7;2.5&#xFF09;&#xFF0C;&#x4E00;&#x4E2A;&#x7C7B;&#x578B;&#x540C;&#x6837;&#x53EF;&#x4EE5;&#x5B9A;&#x5236;&#x81EA;&#x5DF1;&#x7684;JSON&#x7F16;&#x7801;&#x548C;&#x89E3;&#x7801;&#x884C;&#x4E3A;&#x3002;time.Time&#x7C7B;&#x578B;&#x5BF9;&#x5E94;&#x7684;JSON&#x503C;&#x662F;&#x4E00;&#x4E2A;&#x6807;&#x51C6;&#x65F6;&#x95F4;&#x683C;&#x5F0F;&#x7684;&#x5B57;&#x7B26;&#x4E32;&#x3002;</p>
<p>&#x751F;&#x6210;&#x6A21;&#x677F;&#x7684;&#x8F93;&#x51FA;&#x9700;&#x8981;&#x4E24;&#x4E2A;&#x5904;&#x7406;&#x6B65;&#x9AA4;&#x3002;&#x7B2C;&#x4E00;&#x6B65;&#x662F;&#x8981;&#x5206;&#x6790;&#x6A21;&#x677F;&#x5E76;&#x8F6C;&#x4E3A;&#x5185;&#x90E8;&#x8868;&#x793A;&#xFF0C;&#x7136;&#x540E;&#x57FA;&#x4E8E;&#x6307;&#x5B9A;&#x7684;&#x8F93;&#x5165;&#x6267;&#x884C;&#x6A21;&#x677F;&#x3002;&#x5206;&#x6790;&#x6A21;&#x677F;&#x90E8;&#x5206;&#x4E00;&#x822C;&#x53EA;&#x9700;&#x8981;&#x6267;&#x884C;&#x4E00;&#x6B21;&#x3002;&#x4E0B;&#x9762;&#x7684;&#x4EE3;&#x7801;&#x521B;&#x5EFA;&#x5E76;&#x5206;&#x6790;&#x4E0A;&#x9762;&#x5B9A;&#x4E49;&#x7684;&#x6A21;&#x677F;templ&#x3002;&#x6CE8;&#x610F;&#x65B9;&#x6CD5;&#x8C03;&#x7528;&#x94FE;&#x7684;&#x987A;&#x5E8F;&#xFF1A;template.New&#x5148;&#x521B;&#x5EFA;&#x5E76;&#x8FD4;&#x56DE;&#x4E00;&#x4E2A;&#x6A21;&#x677F;&#xFF1B;Funcs&#x65B9;&#x6CD5;&#x5C06;daysAgo&#x7B49;&#x81EA;&#x5B9A;&#x4E49;&#x51FD;&#x6570;&#x6CE8;&#x518C;&#x5230;&#x6A21;&#x677F;&#x4E2D;&#xFF0C;&#x5E76;&#x8FD4;&#x56DE;&#x6A21;&#x677F;&#xFF1B;&#x6700;&#x540E;&#x8C03;&#x7528;Parse&#x51FD;&#x6570;&#x5206;&#x6790;&#x6A21;&#x677F;&#x3002;</p>
<pre><code class="lang-Go">report, err := template.New(<span class="hljs-string">&quot;report&quot;</span>).
    Funcs(template.FuncMap{<span class="hljs-string">&quot;daysAgo&quot;</span>: daysAgo}).
    Parse(templ)
<span class="hljs-keyword">if</span> err != <span class="hljs-literal">nil</span> {
    log.Fatal(err)
}
</code></pre>
<p>&#x56E0;&#x4E3A;&#x6A21;&#x677F;&#x901A;&#x5E38;&#x5728;&#x7F16;&#x8BD1;&#x65F6;&#x5C31;&#x6D4B;&#x8BD5;&#x597D;&#x4E86;&#xFF0C;&#x5982;&#x679C;&#x6A21;&#x677F;&#x89E3;&#x6790;&#x5931;&#x8D25;&#x5C06;&#x662F;&#x4E00;&#x4E2A;&#x81F4;&#x547D;&#x7684;&#x9519;&#x8BEF;&#x3002;template.Must&#x8F85;&#x52A9;&#x51FD;&#x6570;&#x53EF;&#x4EE5;&#x7B80;&#x5316;&#x8FD9;&#x4E2A;&#x81F4;&#x547D;&#x9519;&#x8BEF;&#x7684;&#x5904;&#x7406;&#xFF1A;&#x5B83;&#x63A5;&#x53D7;&#x4E00;&#x4E2A;&#x6A21;&#x677F;&#x548C;&#x4E00;&#x4E2A;error&#x7C7B;&#x578B;&#x7684;&#x53C2;&#x6570;&#xFF0C;&#x68C0;&#x6D4B;error&#x662F;&#x5426;&#x4E3A;nil&#xFF08;&#x5982;&#x679C;&#x4E0D;&#x662F;nil&#x5219;&#x53D1;&#x51FA;panic&#x5F02;&#x5E38;&#xFF09;&#xFF0C;&#x7136;&#x540E;&#x8FD4;&#x56DE;&#x4F20;&#x5165;&#x7684;&#x6A21;&#x677F;&#x3002;&#x6211;&#x4EEC;&#x5C06;&#x5728;5.9&#x8282;&#x518D;&#x8BA8;&#x8BBA;&#x8FD9;&#x4E2A;&#x8BDD;&#x9898;&#x3002;</p>
<p>&#x4E00;&#x65E6;&#x6A21;&#x677F;&#x5DF2;&#x7ECF;&#x521B;&#x5EFA;&#x3001;&#x6CE8;&#x518C;&#x4E86;daysAgo&#x51FD;&#x6570;&#x3001;&#x5E76;&#x901A;&#x8FC7;&#x5206;&#x6790;&#x548C;&#x68C0;&#x6D4B;&#xFF0C;&#x6211;&#x4EEC;&#x5C31;&#x53EF;&#x4EE5;&#x4F7F;&#x7528;github.IssuesSearchResult&#x4F5C;&#x4E3A;&#x8F93;&#x5165;&#x6E90;&#x3001;os.Stdout&#x4F5C;&#x4E3A;&#x8F93;&#x51FA;&#x6E90;&#x6765;&#x6267;&#x884C;&#x6A21;&#x677F;&#xFF1A;</p>
<pre><code class="lang-Go"><span class="hljs-keyword">var</span> report = template.Must(template.New(<span class="hljs-string">&quot;issuelist&quot;</span>).
    Funcs(template.FuncMap{<span class="hljs-string">&quot;daysAgo&quot;</span>: daysAgo}).
    Parse(templ))

<span class="hljs-keyword">func</span> main() {
    result, err := github.SearchIssues(os.Args[<span class="hljs-number">1</span>:])
    <span class="hljs-keyword">if</span> err != <span class="hljs-literal">nil</span> {
        log.Fatal(err)
    }
    <span class="hljs-keyword">if</span> err := report.Execute(os.Stdout, result); err != <span class="hljs-literal">nil</span> {
        log.Fatal(err)
    }
}
</code></pre>
<p>&#x7A0B;&#x5E8F;&#x8F93;&#x51FA;&#x4E00;&#x4E2A;&#x7EAF;&#x6587;&#x672C;&#x62A5;&#x544A;&#xFF1A;</p>
<pre><code>$ go build gopl.io/ch4/issuesreport
$ ./issuesreport repo:golang/go is:open json decoder
13 issues:
----------------------------------------
Number: 5680
User:      eaigner
Title:     encoding/json: set key converter on en/decoder
Age:       750 days
----------------------------------------
Number: 6050
User:      gopherbot
Title:     encoding/json: provide tokenizer
Age:       695 days
----------------------------------------
...
</code></pre><p>&#x73B0;&#x5728;&#x8BA9;&#x6211;&#x4EEC;&#x8F6C;&#x5230;html/template&#x6A21;&#x677F;&#x5305;&#x3002;&#x5B83;&#x4F7F;&#x7528;&#x548C;text/template&#x5305;&#x76F8;&#x540C;&#x7684;API&#x548C;&#x6A21;&#x677F;&#x8BED;&#x8A00;&#xFF0C;&#x4F46;&#x662F;&#x589E;&#x52A0;&#x4E86;&#x4E00;&#x4E2A;&#x5C06;&#x5B57;&#x7B26;&#x4E32;&#x81EA;&#x52A8;&#x8F6C;&#x4E49;&#x7279;&#x6027;&#xFF0C;&#x8FD9;&#x53EF;&#x4EE5;&#x907F;&#x514D;&#x8F93;&#x5165;&#x5B57;&#x7B26;&#x4E32;&#x548C;HTML&#x3001;JavaScript&#x3001;CSS&#x6216;URL&#x8BED;&#x6CD5;&#x4EA7;&#x751F;&#x51B2;&#x7A81;&#x7684;&#x95EE;&#x9898;&#x3002;&#x8FD9;&#x4E2A;&#x7279;&#x6027;&#x8FD8;&#x53EF;&#x4EE5;&#x907F;&#x514D;&#x4E00;&#x4E9B;&#x957F;&#x671F;&#x5B58;&#x5728;&#x7684;&#x5B89;&#x5168;&#x95EE;&#x9898;&#xFF0C;&#x6BD4;&#x5982;&#x901A;&#x8FC7;&#x751F;&#x6210;HTML&#x6CE8;&#x5165;&#x653B;&#x51FB;&#xFF0C;&#x901A;&#x8FC7;&#x6784;&#x9020;&#x4E00;&#x4E2A;&#x542B;&#x6709;&#x6076;&#x610F;&#x4EE3;&#x7801;&#x7684;&#x95EE;&#x9898;&#x6807;&#x9898;&#xFF0C;&#x8FD9;&#x4E9B;&#x90FD;&#x53EF;&#x80FD;&#x8BA9;&#x6A21;&#x677F;&#x8F93;&#x51FA;&#x9519;&#x8BEF;&#x7684;&#x8F93;&#x51FA;&#xFF0C;&#x4ECE;&#x800C;&#x8BA9;&#x4ED6;&#x4EEC;&#x63A7;&#x5236;&#x9875;&#x9762;&#x3002;</p>
<p>&#x4E0B;&#x9762;&#x7684;&#x6A21;&#x677F;&#x4EE5;HTML&#x683C;&#x5F0F;&#x8F93;&#x51FA;issue&#x5217;&#x8868;&#x3002;&#x6CE8;&#x610F;import&#x8BED;&#x53E5;&#x7684;&#x4E0D;&#x540C;&#xFF1A;</p>
<p><u><i>gopl.io/ch4/issueshtml</i></u></p>
<pre><code class="lang-Go"><span class="hljs-keyword">import</span> <span class="hljs-string">&quot;html/template&quot;</span>

<span class="hljs-keyword">var</span> issueList = template.Must(template.New(<span class="hljs-string">&quot;issuelist&quot;</span>).Parse(<span class="hljs-string">`
&lt;h1&gt;{{.TotalCount}} issues&lt;/h1&gt;
&lt;table&gt;
&lt;tr style=&apos;text-align: left&apos;&gt;
  &lt;th&gt;#&lt;/th&gt;
  &lt;th&gt;State&lt;/th&gt;
  &lt;th&gt;User&lt;/th&gt;
  &lt;th&gt;Title&lt;/th&gt;
&lt;/tr&gt;
{{range .Items}}
&lt;tr&gt;
  &lt;td&gt;&lt;a href=&apos;{{.HTMLURL}}&apos;&gt;{{.Number}}&lt;/a&gt;&lt;/td&gt;
  &lt;td&gt;{{.State}}&lt;/td&gt;
  &lt;td&gt;&lt;a href=&apos;{{.User.HTMLURL}}&apos;&gt;{{.User.Login}}&lt;/a&gt;&lt;/td&gt;
  &lt;td&gt;&lt;a href=&apos;{{.HTMLURL}}&apos;&gt;{{.Title}}&lt;/a&gt;&lt;/td&gt;
&lt;/tr&gt;
{{end}}
&lt;/table&gt;
`</span>))
</code></pre>
<p>&#x4E0B;&#x9762;&#x7684;&#x547D;&#x4EE4;&#x5C06;&#x5728;&#x65B0;&#x7684;&#x6A21;&#x677F;&#x4E0A;&#x6267;&#x884C;&#x4E00;&#x4E2A;&#x7A0D;&#x5FAE;&#x4E0D;&#x540C;&#x7684;&#x67E5;&#x8BE2;&#xFF1A;</p>
<pre><code>$ go build gopl.io/ch4/issueshtml
$ ./issueshtml repo:golang/go commenter:gopherbot json encoder &gt;issues.html
</code></pre><p>&#x56FE;4.4&#x663E;&#x793A;&#x4E86;&#x5728;web&#x6D4F;&#x89C8;&#x5668;&#x4E2D;&#x7684;&#x6548;&#x679C;&#x56FE;&#x3002;&#x6BCF;&#x4E2A;issue&#x5305;&#x542B;&#x5230;Github&#x5BF9;&#x5E94;&#x9875;&#x9762;&#x7684;&#x94FE;&#x63A5;&#x3002;</p>
<p><img src="../images/ch4-04.png" alt=""></p>
<p>&#x56FE;4.4&#x4E2D;issue&#x6CA1;&#x6709;&#x5305;&#x542B;&#x4F1A;&#x5BF9;HTML&#x683C;&#x5F0F;&#x4EA7;&#x751F;&#x51B2;&#x7A81;&#x7684;&#x7279;&#x6B8A;&#x5B57;&#x7B26;&#xFF0C;&#x4F46;&#x662F;&#x6211;&#x4EEC;&#x9A6C;&#x4E0A;&#x5C06;&#x770B;&#x5230;&#x6807;&#x9898;&#x4E2D;&#x542B;&#x6709;<code>&amp;</code>&#x548C;<code>&lt;</code>&#x5B57;&#x7B26;&#x7684;issue&#x3002;&#x4E0B;&#x9762;&#x7684;&#x547D;&#x4EE4;&#x9009;&#x62E9;&#x4E86;&#x4E24;&#x4E2A;&#x8FD9;&#x6837;&#x7684;issue&#xFF1A;</p>
<pre><code>$ ./issueshtml repo:golang/go 3133 10535 &gt;issues2.html
</code></pre><p>&#x56FE;4.5&#x663E;&#x793A;&#x4E86;&#x8BE5;&#x67E5;&#x8BE2;&#x7684;&#x7ED3;&#x679C;&#x3002;&#x6CE8;&#x610F;&#xFF0C;html/template&#x5305;&#x5DF2;&#x7ECF;&#x81EA;&#x52A8;&#x5C06;&#x7279;&#x6B8A;&#x5B57;&#x7B26;&#x8F6C;&#x4E49;&#xFF0C;&#x56E0;&#x6B64;&#x6211;&#x4EEC;&#x4F9D;&#x7136;&#x53EF;&#x4EE5;&#x770B;&#x5230;&#x6B63;&#x786E;&#x7684;&#x5B57;&#x9762;&#x503C;&#x3002;&#x5982;&#x679C;&#x6211;&#x4EEC;&#x4F7F;&#x7528;text/template&#x5305;&#x7684;&#x8BDD;&#xFF0C;&#x8FD9;2&#x4E2A;issue&#x5C06;&#x4F1A;&#x4EA7;&#x751F;&#x9519;&#x8BEF;&#xFF0C;&#x5176;&#x4E2D;&#x201C;&amp;lt;&#x201D;&#x56DB;&#x4E2A;&#x5B57;&#x7B26;&#x5C06;&#x4F1A;&#x88AB;&#x5F53;&#x4F5C;&#x5C0F;&#x4E8E;&#x5B57;&#x7B26;&#x201C;&lt;&#x201D;&#x5904;&#x7406;&#xFF0C;&#x540C;&#x65F6;&#x201C;&lt;link&gt;&#x201D;&#x5B57;&#x7B26;&#x4E32;&#x5C06;&#x4F1A;&#x88AB;&#x5F53;&#x4F5C;&#x4E00;&#x4E2A;&#x94FE;&#x63A5;&#x5143;&#x7D20;&#x5904;&#x7406;&#xFF0C;&#x5B83;&#x4EEC;&#x90FD;&#x4F1A;&#x5BFC;&#x81F4;HTML&#x6587;&#x6863;&#x7ED3;&#x6784;&#x7684;&#x6539;&#x53D8;&#xFF0C;&#x4ECE;&#x800C;&#x5BFC;&#x81F4;&#x6709;&#x672A;&#x77E5;&#x7684;&#x98CE;&#x9669;&#x3002;</p>
<p>&#x6211;&#x4EEC;&#x4E5F;&#x53EF;&#x4EE5;&#x901A;&#x8FC7;&#x5BF9;&#x4FE1;&#x4EFB;&#x7684;HTML&#x5B57;&#x7B26;&#x4E32;&#x4F7F;&#x7528;template.HTML&#x7C7B;&#x578B;&#x6765;&#x6291;&#x5236;&#x8FD9;&#x79CD;&#x81EA;&#x52A8;&#x8F6C;&#x4E49;&#x7684;&#x884C;&#x4E3A;&#x3002;&#x8FD8;&#x6709;&#x5F88;&#x591A;&#x91C7;&#x7528;&#x7C7B;&#x578B;&#x547D;&#x540D;&#x7684;&#x5B57;&#x7B26;&#x4E32;&#x7C7B;&#x578B;&#x5206;&#x522B;&#x5BF9;&#x5E94;&#x4FE1;&#x4EFB;&#x7684;JavaScript&#x3001;CSS&#x548C;URL&#x3002;&#x4E0B;&#x9762;&#x7684;&#x7A0B;&#x5E8F;&#x6F14;&#x793A;&#x4E86;&#x4E24;&#x4E2A;&#x4F7F;&#x7528;&#x4E0D;&#x540C;&#x7C7B;&#x578B;&#x7684;&#x76F8;&#x540C;&#x5B57;&#x7B26;&#x4E32;&#x4EA7;&#x751F;&#x7684;&#x4E0D;&#x540C;&#x7ED3;&#x679C;&#xFF1A;A&#x662F;&#x4E00;&#x4E2A;&#x666E;&#x901A;&#x5B57;&#x7B26;&#x4E32;&#xFF0C;B&#x662F;&#x4E00;&#x4E2A;&#x4FE1;&#x4EFB;&#x7684;template.HTML&#x5B57;&#x7B26;&#x4E32;&#x7C7B;&#x578B;&#x3002;</p>
<p><img src="../images/ch4-05.png" alt=""></p>
<p><u><i>gopl.io/ch4/autoescape</i></u></p>
<pre><code class="lang-Go"><span class="hljs-keyword">func</span> main() {
    <span class="hljs-keyword">const</span> templ = <span class="hljs-string">`&lt;p&gt;A: {{.A}}&lt;/p&gt;&lt;p&gt;B: {{.B}}&lt;/p&gt;`</span>
    t := template.Must(template.New(<span class="hljs-string">&quot;escape&quot;</span>).Parse(templ))
    <span class="hljs-keyword">var</span> data <span class="hljs-keyword">struct</span> {
        A <span class="hljs-keyword">string</span>        <span class="hljs-comment">// untrusted plain text</span>
        B template.HTML <span class="hljs-comment">// trusted HTML</span>
    }
    data.A = <span class="hljs-string">&quot;&lt;b&gt;Hello!&lt;/b&gt;&quot;</span>
    data.B = <span class="hljs-string">&quot;&lt;b&gt;Hello!&lt;/b&gt;&quot;</span>
    <span class="hljs-keyword">if</span> err := t.Execute(os.Stdout, data); err != <span class="hljs-literal">nil</span> {
        log.Fatal(err)
    }
}
</code></pre>
<p>&#x56FE;4.6&#x663E;&#x793A;&#x4E86;&#x51FA;&#x73B0;&#x5728;&#x6D4F;&#x89C8;&#x5668;&#x4E2D;&#x7684;&#x6A21;&#x677F;&#x8F93;&#x51FA;&#x3002;&#x6211;&#x4EEC;&#x770B;&#x5230;A&#x7684;&#x9ED1;&#x4F53;&#x6807;&#x8BB0;&#x88AB;&#x8F6C;&#x4E49;&#x5931;&#x6548;&#x4E86;&#xFF0C;&#x4F46;&#x662F;B&#x6CA1;&#x6709;&#x3002;</p>
<p><img src="../images/ch4-06.png" alt=""></p>
<p>&#x6211;&#x4EEC;&#x8FD9;&#x91CC;&#x53EA;&#x8BB2;&#x8FF0;&#x4E86;&#x6A21;&#x677F;&#x7CFB;&#x7EDF;&#x4E2D;&#x6700;&#x57FA;&#x672C;&#x7684;&#x7279;&#x6027;&#x3002;&#x4E00;&#x5982;&#x65E2;&#x5F80;&#xFF0C;&#x5982;&#x679C;&#x60F3;&#x4E86;&#x89E3;&#x66F4;&#x591A;&#x7684;&#x4FE1;&#x606F;&#xFF0C;&#x8BF7;&#x81EA;&#x5DF1;&#x67E5;&#x770B;&#x5305;&#x6587;&#x6863;&#xFF1A;</p>
<pre><code>$ go doc text/template
$ go doc html/template
</code></pre><p><strong>&#x7EC3;&#x4E60; 4.14&#xFF1A;</strong> &#x521B;&#x5EFA;&#x4E00;&#x4E2A;web&#x670D;&#x52A1;&#x5668;&#xFF0C;&#x67E5;&#x8BE2;&#x4E00;&#x6B21;GitHub&#xFF0C;&#x7136;&#x540E;&#x751F;&#x6210;BUG&#x62A5;&#x544A;&#x3001;&#x91CC;&#x7A0B;&#x7891;&#x548C;&#x5BF9;&#x5E94;&#x7684;&#x7528;&#x6237;&#x4FE1;&#x606F;&#x3002;</p>

                                
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